a²-4b²-1+2b快
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a²-4b²-1+2b快
a²-4b²-1+2b
快
a²-4b²-1+2b快
疑似:
a²-4b²-1+4b
=a²-(4b²+1-4b)
=a²-(2b-1)²
=(a-2b+1)(a+2b-1)
a²-4b²-a+2b
=(a²-4b²)-(a-2b)
=(a+2b)(a-2b)-(a-2b)
=(a-2b)(a+2b-1)
快什么啊!题目都不说清楚